| 1 | /* |
| 2 | * Babeltrace - CTF binary type reader (BTR) |
| 3 | * |
| 4 | * Copyright (c) 2015-2016 EfficiOS Inc. and Linux Foundation |
| 5 | * Copyright (c) 2015-2016 Philippe Proulx <pproulx@efficios.com> |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | * of this software and associated documentation files (the "Software"), to deal |
| 9 | * in the Software without restriction, including without limitation the rights |
| 10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | * copies of the Software, and to permit persons to whom the Software is |
| 12 | * furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included in |
| 15 | * all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 23 | * SOFTWARE. |
| 24 | */ |
| 25 | |
| 26 | #define BT_LOG_TAG "PLUGIN-CTF-BTR" |
| 27 | #include "logging.h" |
| 28 | |
| 29 | #include <stdlib.h> |
| 30 | #include <stdint.h> |
| 31 | #include <inttypes.h> |
| 32 | #include <stdio.h> |
| 33 | #include <stddef.h> |
| 34 | #include <stdbool.h> |
| 35 | #include <babeltrace/assert-internal.h> |
| 36 | #include <string.h> |
| 37 | #include <babeltrace/bitfield-internal.h> |
| 38 | #include <babeltrace/common-internal.h> |
| 39 | #include <babeltrace/babeltrace.h> |
| 40 | #include <babeltrace/ref.h> |
| 41 | #include <babeltrace/align-internal.h> |
| 42 | #include <glib.h> |
| 43 | |
| 44 | #include "btr.h" |
| 45 | #include "../metadata/ctf-meta.h" |
| 46 | |
| 47 | #define DIV8(_x) ((_x) >> 3) |
| 48 | #define BYTES_TO_BITS(_x) ((_x) * 8) |
| 49 | #define BITS_TO_BYTES_FLOOR(_x) DIV8(_x) |
| 50 | #define BITS_TO_BYTES_CEIL(_x) DIV8((_x) + 7) |
| 51 | #define IN_BYTE_OFFSET(_at) ((_at) & 7) |
| 52 | |
| 53 | /* A visit stack entry */ |
| 54 | struct stack_entry { |
| 55 | /* |
| 56 | * Current type of base field, one of: |
| 57 | * |
| 58 | * * Structure |
| 59 | * * Array |
| 60 | * * Sequence |
| 61 | * * Variant |
| 62 | */ |
| 63 | struct ctf_field_type *base_type; |
| 64 | |
| 65 | /* Length of base field (always 1 for variant types) */ |
| 66 | int64_t base_len; |
| 67 | |
| 68 | /* Index of next field to read */ |
| 69 | int64_t index; |
| 70 | }; |
| 71 | |
| 72 | /* Visit stack */ |
| 73 | struct stack { |
| 74 | /* Entries (struct stack_entry) */ |
| 75 | GArray *entries; |
| 76 | |
| 77 | /* Number of active entries */ |
| 78 | size_t size; |
| 79 | }; |
| 80 | |
| 81 | /* Reading states */ |
| 82 | enum btr_state { |
| 83 | BTR_STATE_NEXT_FIELD, |
| 84 | BTR_STATE_ALIGN_BASIC, |
| 85 | BTR_STATE_ALIGN_COMPOUND, |
| 86 | BTR_STATE_READ_BASIC_BEGIN, |
| 87 | BTR_STATE_READ_BASIC_CONTINUE, |
| 88 | BTR_STATE_DONE, |
| 89 | }; |
| 90 | |
| 91 | /* Binary type reader */ |
| 92 | struct bt_btr { |
| 93 | /* Bisit stack */ |
| 94 | struct stack *stack; |
| 95 | |
| 96 | /* Current basic field type */ |
| 97 | struct ctf_field_type *cur_basic_field_type; |
| 98 | |
| 99 | /* Current state */ |
| 100 | enum btr_state state; |
| 101 | |
| 102 | /* |
| 103 | * Last basic field type's byte order. |
| 104 | * |
| 105 | * This is used to detect errors since two contiguous basic |
| 106 | * types for which the common boundary is not the boundary of |
| 107 | * a byte cannot have different byte orders. |
| 108 | * |
| 109 | * This is set to -1 on reset and when the last basic field type |
| 110 | * was a string type. |
| 111 | */ |
| 112 | enum ctf_byte_order last_bo; |
| 113 | |
| 114 | /* Current byte order (copied to last_bo after a successful read) */ |
| 115 | enum ctf_byte_order cur_bo; |
| 116 | |
| 117 | /* Stitch buffer infos */ |
| 118 | struct { |
| 119 | /* Stitch buffer */ |
| 120 | uint8_t buf[16]; |
| 121 | |
| 122 | /* Offset, within stitch buffer, of first bit */ |
| 123 | size_t offset; |
| 124 | |
| 125 | /* Length (bits) of data in stitch buffer from offset */ |
| 126 | size_t at; |
| 127 | } stitch; |
| 128 | |
| 129 | /* User buffer infos */ |
| 130 | struct { |
| 131 | /* Address */ |
| 132 | const uint8_t *addr; |
| 133 | |
| 134 | /* Offset of data from address (bits) */ |
| 135 | size_t offset; |
| 136 | |
| 137 | /* Current position from offset (bits) */ |
| 138 | size_t at; |
| 139 | |
| 140 | /* Offset of offset within whole packet (bits) */ |
| 141 | size_t packet_offset; |
| 142 | |
| 143 | /* Data size in buffer (bits) */ |
| 144 | size_t sz; |
| 145 | |
| 146 | /* Buffer size (bytes) */ |
| 147 | size_t buf_sz; |
| 148 | } buf; |
| 149 | |
| 150 | /* User stuff */ |
| 151 | struct { |
| 152 | /* Callback functions */ |
| 153 | struct bt_btr_cbs cbs; |
| 154 | |
| 155 | /* Private data */ |
| 156 | void *data; |
| 157 | } user; |
| 158 | }; |
| 159 | |
| 160 | static inline |
| 161 | const char *btr_state_string(enum btr_state state) |
| 162 | { |
| 163 | switch (state) { |
| 164 | case BTR_STATE_NEXT_FIELD: |
| 165 | return "BTR_STATE_NEXT_FIELD"; |
| 166 | case BTR_STATE_ALIGN_BASIC: |
| 167 | return "BTR_STATE_ALIGN_BASIC"; |
| 168 | case BTR_STATE_ALIGN_COMPOUND: |
| 169 | return "BTR_STATE_ALIGN_COMPOUND"; |
| 170 | case BTR_STATE_READ_BASIC_BEGIN: |
| 171 | return "BTR_STATE_READ_BASIC_BEGIN"; |
| 172 | case BTR_STATE_READ_BASIC_CONTINUE: |
| 173 | return "BTR_STATE_READ_BASIC_CONTINUE"; |
| 174 | case BTR_STATE_DONE: |
| 175 | return "BTR_STATE_DONE"; |
| 176 | default: |
| 177 | return "(unknown)"; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | static |
| 182 | struct stack *stack_new(void) |
| 183 | { |
| 184 | struct stack *stack = NULL; |
| 185 | |
| 186 | stack = g_new0(struct stack, 1); |
| 187 | if (!stack) { |
| 188 | BT_LOGE_STR("Failed to allocate one stack."); |
| 189 | goto error; |
| 190 | } |
| 191 | |
| 192 | stack->entries = g_array_new(FALSE, TRUE, sizeof(struct stack_entry)); |
| 193 | if (!stack->entries) { |
| 194 | BT_LOGE_STR("Failed to allocate a GArray."); |
| 195 | goto error; |
| 196 | } |
| 197 | |
| 198 | BT_LOGD("Created stack: addr=%p", stack); |
| 199 | return stack; |
| 200 | |
| 201 | error: |
| 202 | g_free(stack); |
| 203 | return NULL; |
| 204 | } |
| 205 | |
| 206 | static |
| 207 | void stack_destroy(struct stack *stack) |
| 208 | { |
| 209 | if (!stack) { |
| 210 | return; |
| 211 | } |
| 212 | |
| 213 | BT_LOGD("Destroying stack: addr=%p", stack); |
| 214 | |
| 215 | if (stack->entries) { |
| 216 | g_array_free(stack->entries, TRUE); |
| 217 | } |
| 218 | |
| 219 | g_free(stack); |
| 220 | } |
| 221 | |
| 222 | static |
| 223 | int stack_push(struct stack *stack, struct ctf_field_type *base_type, |
| 224 | size_t base_len) |
| 225 | { |
| 226 | struct stack_entry *entry; |
| 227 | |
| 228 | BT_ASSERT(stack); |
| 229 | BT_ASSERT(base_type); |
| 230 | BT_LOGV("Pushing field type on stack: stack-addr=%p, " |
| 231 | "ft-addr=%p, ft-id=%d, base-length=%zu, " |
| 232 | "stack-size-before=%zu, stack-size-after=%zu", |
| 233 | stack, base_type, base_type->id, |
| 234 | base_len, stack->size, stack->size + 1); |
| 235 | |
| 236 | if (stack->entries->len == stack->size) { |
| 237 | g_array_set_size(stack->entries, stack->size + 1); |
| 238 | } |
| 239 | |
| 240 | entry = &g_array_index(stack->entries, struct stack_entry, stack->size); |
| 241 | entry->base_type = base_type; |
| 242 | entry->base_len = base_len; |
| 243 | entry->index = 0; |
| 244 | stack->size++; |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static inline |
| 249 | int64_t get_compound_field_type_length(struct bt_btr *btr, |
| 250 | struct ctf_field_type *ft) |
| 251 | { |
| 252 | int64_t length; |
| 253 | |
| 254 | switch (ft->id) { |
| 255 | case CTF_FIELD_TYPE_ID_STRUCT: |
| 256 | { |
| 257 | struct ctf_field_type_struct *struct_ft = (void *) ft; |
| 258 | |
| 259 | length = (int64_t) struct_ft->members->len; |
| 260 | break; |
| 261 | } |
| 262 | case CTF_FIELD_TYPE_ID_VARIANT: |
| 263 | { |
| 264 | /* Variant field types always "contain" a single type */ |
| 265 | length = 1; |
| 266 | break; |
| 267 | } |
| 268 | case CTF_FIELD_TYPE_ID_ARRAY: |
| 269 | { |
| 270 | struct ctf_field_type_array *array_ft = (void *) ft; |
| 271 | |
| 272 | length = (int64_t) array_ft->length; |
| 273 | break; |
| 274 | } |
| 275 | case CTF_FIELD_TYPE_ID_SEQUENCE: |
| 276 | length = btr->user.cbs.query.get_sequence_length(ft, |
| 277 | btr->user.data); |
| 278 | break; |
| 279 | default: |
| 280 | abort(); |
| 281 | } |
| 282 | |
| 283 | return length; |
| 284 | } |
| 285 | |
| 286 | static |
| 287 | int stack_push_with_len(struct bt_btr *btr, struct ctf_field_type *base_type) |
| 288 | { |
| 289 | int ret; |
| 290 | int64_t length = get_compound_field_type_length(btr, base_type); |
| 291 | |
| 292 | if (length < 0) { |
| 293 | BT_LOGW("Cannot get compound field type's field count: " |
| 294 | "btr-addr=%p, ft-addr=%p, ft-id=%d", |
| 295 | btr, base_type, base_type->id); |
| 296 | ret = BT_BTR_STATUS_ERROR; |
| 297 | goto end; |
| 298 | } |
| 299 | |
| 300 | ret = stack_push(btr->stack, base_type, (size_t) length); |
| 301 | |
| 302 | end: |
| 303 | return ret; |
| 304 | } |
| 305 | |
| 306 | static inline |
| 307 | unsigned int stack_size(struct stack *stack) |
| 308 | { |
| 309 | BT_ASSERT(stack); |
| 310 | return stack->size; |
| 311 | } |
| 312 | |
| 313 | static |
| 314 | void stack_pop(struct stack *stack) |
| 315 | { |
| 316 | BT_ASSERT(stack); |
| 317 | BT_ASSERT(stack_size(stack)); |
| 318 | BT_LOGV("Popping from stack: " |
| 319 | "stack-addr=%p, stack-size-before=%u, stack-size-after=%u", |
| 320 | stack, stack->entries->len, stack->entries->len - 1); |
| 321 | stack->size--; |
| 322 | } |
| 323 | |
| 324 | static inline |
| 325 | bool stack_empty(struct stack *stack) |
| 326 | { |
| 327 | return stack_size(stack) == 0; |
| 328 | } |
| 329 | |
| 330 | static |
| 331 | void stack_clear(struct stack *stack) |
| 332 | { |
| 333 | BT_ASSERT(stack); |
| 334 | stack->size = 0; |
| 335 | } |
| 336 | |
| 337 | static inline |
| 338 | struct stack_entry *stack_top(struct stack *stack) |
| 339 | { |
| 340 | BT_ASSERT(stack); |
| 341 | BT_ASSERT(stack_size(stack)); |
| 342 | return &g_array_index(stack->entries, struct stack_entry, |
| 343 | stack->size - 1); |
| 344 | } |
| 345 | |
| 346 | static inline |
| 347 | size_t available_bits(struct bt_btr *btr) |
| 348 | { |
| 349 | return btr->buf.sz - btr->buf.at; |
| 350 | } |
| 351 | |
| 352 | static inline |
| 353 | void consume_bits(struct bt_btr *btr, size_t incr) |
| 354 | { |
| 355 | BT_LOGV("Advancing cursor: btr-addr=%p, cur-before=%zu, cur-after=%zu", |
| 356 | btr, btr->buf.at, btr->buf.at + incr); |
| 357 | btr->buf.at += incr; |
| 358 | } |
| 359 | |
| 360 | static inline |
| 361 | bool has_enough_bits(struct bt_btr *btr, size_t sz) |
| 362 | { |
| 363 | return available_bits(btr) >= sz; |
| 364 | } |
| 365 | |
| 366 | static inline |
| 367 | bool at_least_one_bit_left(struct bt_btr *btr) |
| 368 | { |
| 369 | return has_enough_bits(btr, 1); |
| 370 | } |
| 371 | |
| 372 | static inline |
| 373 | size_t packet_at(struct bt_btr *btr) |
| 374 | { |
| 375 | return btr->buf.packet_offset + btr->buf.at; |
| 376 | } |
| 377 | |
| 378 | static inline |
| 379 | size_t buf_at_from_addr(struct bt_btr *btr) |
| 380 | { |
| 381 | /* |
| 382 | * Considering this: |
| 383 | * |
| 384 | * ====== offset ===== (17) |
| 385 | * |
| 386 | * xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx |
| 387 | * ^ |
| 388 | * addr (0) ==== at ==== (12) |
| 389 | * |
| 390 | * We want this: |
| 391 | * |
| 392 | * =============================== (29) |
| 393 | */ |
| 394 | return btr->buf.offset + btr->buf.at; |
| 395 | } |
| 396 | |
| 397 | static |
| 398 | void stitch_reset(struct bt_btr *btr) |
| 399 | { |
| 400 | btr->stitch.offset = 0; |
| 401 | btr->stitch.at = 0; |
| 402 | } |
| 403 | |
| 404 | static inline |
| 405 | size_t stitch_at_from_addr(struct bt_btr *btr) |
| 406 | { |
| 407 | return btr->stitch.offset + btr->stitch.at; |
| 408 | } |
| 409 | |
| 410 | static |
| 411 | void stitch_append_from_buf(struct bt_btr *btr, size_t sz) |
| 412 | { |
| 413 | size_t stitch_byte_at; |
| 414 | size_t buf_byte_at; |
| 415 | size_t nb_bytes; |
| 416 | |
| 417 | if (sz == 0) { |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | stitch_byte_at = |
| 422 | BITS_TO_BYTES_FLOOR(stitch_at_from_addr(btr)); |
| 423 | buf_byte_at = BITS_TO_BYTES_FLOOR(buf_at_from_addr(btr)); |
| 424 | nb_bytes = BITS_TO_BYTES_CEIL(sz); |
| 425 | BT_ASSERT(nb_bytes > 0); |
| 426 | BT_ASSERT(btr->buf.addr); |
| 427 | memcpy(&btr->stitch.buf[stitch_byte_at], &btr->buf.addr[buf_byte_at], |
| 428 | nb_bytes); |
| 429 | btr->stitch.at += sz; |
| 430 | consume_bits(btr, sz); |
| 431 | } |
| 432 | |
| 433 | static |
| 434 | void stitch_append_from_remaining_buf(struct bt_btr *btr) |
| 435 | { |
| 436 | stitch_append_from_buf(btr, available_bits(btr)); |
| 437 | } |
| 438 | |
| 439 | static |
| 440 | void stitch_set_from_remaining_buf(struct bt_btr *btr) |
| 441 | { |
| 442 | stitch_reset(btr); |
| 443 | btr->stitch.offset = IN_BYTE_OFFSET(buf_at_from_addr(btr)); |
| 444 | stitch_append_from_remaining_buf(btr); |
| 445 | } |
| 446 | |
| 447 | static inline |
| 448 | void read_unsigned_bitfield(const uint8_t *buf, size_t at, |
| 449 | unsigned int field_size, enum ctf_byte_order bo, |
| 450 | uint64_t *v) |
| 451 | { |
| 452 | switch (bo) { |
| 453 | case CTF_BYTE_ORDER_BIG: |
| 454 | bt_bitfield_read_be(buf, uint8_t, at, field_size, v); |
| 455 | break; |
| 456 | case CTF_BYTE_ORDER_LITTLE: |
| 457 | bt_bitfield_read_le(buf, uint8_t, at, field_size, v); |
| 458 | break; |
| 459 | default: |
| 460 | abort(); |
| 461 | } |
| 462 | |
| 463 | BT_LOGV("Read unsigned bit array: cur=%zu, size=%u, " |
| 464 | "bo=%d, val=%" PRIu64, at, field_size, bo, *v); |
| 465 | } |
| 466 | |
| 467 | static inline |
| 468 | void read_signed_bitfield(const uint8_t *buf, size_t at, |
| 469 | unsigned int field_size, enum ctf_byte_order bo, int64_t *v) |
| 470 | { |
| 471 | switch (bo) { |
| 472 | case CTF_BYTE_ORDER_BIG: |
| 473 | bt_bitfield_read_be(buf, uint8_t, at, field_size, v); |
| 474 | break; |
| 475 | case CTF_BYTE_ORDER_LITTLE: |
| 476 | bt_bitfield_read_le(buf, uint8_t, at, field_size, v); |
| 477 | break; |
| 478 | default: |
| 479 | abort(); |
| 480 | } |
| 481 | |
| 482 | BT_LOGV("Read signed bit array: cur=%zu, size=%u, " |
| 483 | "bo=%d, val=%" PRId64, at, field_size, bo, *v); |
| 484 | } |
| 485 | |
| 486 | typedef enum bt_btr_status (* read_basic_and_call_cb_t)(struct bt_btr *, |
| 487 | const uint8_t *, size_t); |
| 488 | |
| 489 | static inline |
| 490 | enum bt_btr_status validate_contiguous_bo(struct bt_btr *btr, |
| 491 | enum ctf_byte_order next_bo) |
| 492 | { |
| 493 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 494 | |
| 495 | /* Always valid when at a byte boundary */ |
| 496 | if (packet_at(btr) % 8 == 0) { |
| 497 | goto end; |
| 498 | } |
| 499 | |
| 500 | /* Always valid if last byte order is unknown */ |
| 501 | if (btr->last_bo == -1) { |
| 502 | goto end; |
| 503 | } |
| 504 | |
| 505 | /* Always valid if next byte order is unknown */ |
| 506 | if (next_bo == -1) { |
| 507 | goto end; |
| 508 | } |
| 509 | |
| 510 | /* Make sure last byte order is compatible with the next byte order */ |
| 511 | switch (btr->last_bo) { |
| 512 | case CTF_BYTE_ORDER_BIG: |
| 513 | if (next_bo != CTF_BYTE_ORDER_BIG) { |
| 514 | status = BT_BTR_STATUS_ERROR; |
| 515 | } |
| 516 | break; |
| 517 | case CTF_BYTE_ORDER_LITTLE: |
| 518 | if (next_bo != CTF_BYTE_ORDER_LITTLE) { |
| 519 | status = BT_BTR_STATUS_ERROR; |
| 520 | } |
| 521 | break; |
| 522 | default: |
| 523 | status = BT_BTR_STATUS_ERROR; |
| 524 | } |
| 525 | |
| 526 | end: |
| 527 | if (status < 0) { |
| 528 | BT_LOGW("Cannot read bit array: two different byte orders not at a byte boundary: " |
| 529 | "btr-addr=%p, last-bo=%d, next-bo=%d", |
| 530 | btr, btr->last_bo, next_bo); |
| 531 | } |
| 532 | |
| 533 | return status; |
| 534 | } |
| 535 | |
| 536 | static |
| 537 | enum bt_btr_status read_basic_float_and_call_cb(struct bt_btr *btr, |
| 538 | const uint8_t *buf, size_t at) |
| 539 | { |
| 540 | double dblval; |
| 541 | unsigned int field_size; |
| 542 | enum ctf_byte_order bo; |
| 543 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 544 | struct ctf_field_type_float *ft = (void *) btr->cur_basic_field_type; |
| 545 | |
| 546 | BT_ASSERT(ft); |
| 547 | field_size = ft->base.size; |
| 548 | bo = ft->base.byte_order; |
| 549 | btr->cur_bo = bo; |
| 550 | |
| 551 | switch (field_size) { |
| 552 | case 32: |
| 553 | { |
| 554 | uint64_t v; |
| 555 | union { |
| 556 | uint32_t u; |
| 557 | float f; |
| 558 | } f32; |
| 559 | |
| 560 | read_unsigned_bitfield(buf, at, field_size, bo, &v); |
| 561 | f32.u = (uint32_t) v; |
| 562 | dblval = (double) f32.f; |
| 563 | break; |
| 564 | } |
| 565 | case 64: |
| 566 | { |
| 567 | union { |
| 568 | uint64_t u; |
| 569 | double d; |
| 570 | } f64; |
| 571 | |
| 572 | read_unsigned_bitfield(buf, at, field_size, bo, &f64.u); |
| 573 | dblval = f64.d; |
| 574 | break; |
| 575 | } |
| 576 | default: |
| 577 | /* Only 32-bit and 64-bit fields are supported currently */ |
| 578 | abort(); |
| 579 | } |
| 580 | |
| 581 | BT_LOGV("Read floating point number value: btr=%p, cur=%zu, val=%f", |
| 582 | btr, at, dblval); |
| 583 | |
| 584 | if (btr->user.cbs.types.floating_point) { |
| 585 | BT_LOGV("Calling user function (floating point number)."); |
| 586 | status = btr->user.cbs.types.floating_point(dblval, |
| 587 | btr->cur_basic_field_type, btr->user.data); |
| 588 | BT_LOGV("User function returned: status=%s", |
| 589 | bt_btr_status_string(status)); |
| 590 | if (status != BT_BTR_STATUS_OK) { |
| 591 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
| 592 | btr, bt_btr_status_string(status)); |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | return status; |
| 597 | } |
| 598 | |
| 599 | static inline |
| 600 | enum bt_btr_status read_basic_int_and_call_cb(struct bt_btr *btr, |
| 601 | const uint8_t *buf, size_t at) |
| 602 | { |
| 603 | unsigned int field_size; |
| 604 | enum ctf_byte_order bo; |
| 605 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 606 | struct ctf_field_type_int *ft = (void *) btr->cur_basic_field_type; |
| 607 | |
| 608 | field_size = ft->base.size; |
| 609 | bo = ft->base.byte_order; |
| 610 | |
| 611 | /* |
| 612 | * Update current byte order now because we could be reading |
| 613 | * the integer value of an enumeration type, and thus we know |
| 614 | * here the actual supporting integer type's byte order. |
| 615 | */ |
| 616 | btr->cur_bo = bo; |
| 617 | |
| 618 | if (ft->is_signed) { |
| 619 | int64_t v; |
| 620 | |
| 621 | read_signed_bitfield(buf, at, field_size, bo, &v); |
| 622 | |
| 623 | if (btr->user.cbs.types.signed_int) { |
| 624 | BT_LOGV("Calling user function (signed integer)."); |
| 625 | status = btr->user.cbs.types.signed_int(v, |
| 626 | btr->cur_basic_field_type, btr->user.data); |
| 627 | BT_LOGV("User function returned: status=%s", |
| 628 | bt_btr_status_string(status)); |
| 629 | if (status != BT_BTR_STATUS_OK) { |
| 630 | BT_LOGW("User function failed: " |
| 631 | "btr-addr=%p, status=%s", |
| 632 | btr, bt_btr_status_string(status)); |
| 633 | } |
| 634 | } |
| 635 | } else { |
| 636 | uint64_t v; |
| 637 | |
| 638 | read_unsigned_bitfield(buf, at, field_size, bo, &v); |
| 639 | |
| 640 | if (btr->user.cbs.types.unsigned_int) { |
| 641 | BT_LOGV("Calling user function (unsigned integer)."); |
| 642 | status = btr->user.cbs.types.unsigned_int(v, |
| 643 | btr->cur_basic_field_type, btr->user.data); |
| 644 | BT_LOGV("User function returned: status=%s", |
| 645 | bt_btr_status_string(status)); |
| 646 | if (status != BT_BTR_STATUS_OK) { |
| 647 | BT_LOGW("User function failed: " |
| 648 | "btr-addr=%p, status=%s", |
| 649 | btr, bt_btr_status_string(status)); |
| 650 | } |
| 651 | } |
| 652 | } |
| 653 | |
| 654 | return status; |
| 655 | } |
| 656 | |
| 657 | static inline |
| 658 | enum bt_btr_status read_bit_array_type_and_call_continue(struct bt_btr *btr, |
| 659 | read_basic_and_call_cb_t read_basic_and_call_cb) |
| 660 | { |
| 661 | size_t available; |
| 662 | size_t needed_bits; |
| 663 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 664 | struct ctf_field_type_bit_array *ft = |
| 665 | (void *) btr->cur_basic_field_type; |
| 666 | |
| 667 | if (!at_least_one_bit_left(btr)) { |
| 668 | BT_LOGV("Reached end of data: btr-addr=%p", btr); |
| 669 | status = BT_BTR_STATUS_EOF; |
| 670 | goto end; |
| 671 | } |
| 672 | |
| 673 | available = available_bits(btr); |
| 674 | needed_bits = ft->size - btr->stitch.at; |
| 675 | BT_LOGV("Continuing basic field decoding: " |
| 676 | "btr-addr=%p, field-size=%u, needed-size=%" PRId64 ", " |
| 677 | "available-size=%zu", |
| 678 | btr, ft->size, needed_bits, available); |
| 679 | if (needed_bits <= available) { |
| 680 | /* We have all the bits; append to stitch, then decode */ |
| 681 | stitch_append_from_buf(btr, needed_bits); |
| 682 | status = read_basic_and_call_cb(btr, btr->stitch.buf, |
| 683 | btr->stitch.offset); |
| 684 | if (status != BT_BTR_STATUS_OK) { |
| 685 | BT_LOGW("Cannot read basic field: " |
| 686 | "btr-addr=%p, ft-addr=%p, status=%s", |
| 687 | btr, btr->cur_basic_field_type, |
| 688 | bt_btr_status_string(status)); |
| 689 | goto end; |
| 690 | } |
| 691 | |
| 692 | if (stack_empty(btr->stack)) { |
| 693 | /* Root is a basic type */ |
| 694 | btr->state = BTR_STATE_DONE; |
| 695 | } else { |
| 696 | /* Go to next field */ |
| 697 | stack_top(btr->stack)->index++; |
| 698 | btr->state = BTR_STATE_NEXT_FIELD; |
| 699 | btr->last_bo = btr->cur_bo; |
| 700 | } |
| 701 | goto end; |
| 702 | } |
| 703 | |
| 704 | /* We are here; it means we don't have enough data to decode this */ |
| 705 | BT_LOGV_STR("Not enough data to read the next basic field: appending to stitch buffer."); |
| 706 | stitch_append_from_remaining_buf(btr); |
| 707 | status = BT_BTR_STATUS_EOF; |
| 708 | |
| 709 | end: |
| 710 | return status; |
| 711 | } |
| 712 | |
| 713 | static inline |
| 714 | enum bt_btr_status read_bit_array_type_and_call_begin(struct bt_btr *btr, |
| 715 | read_basic_and_call_cb_t read_basic_and_call_cb) |
| 716 | { |
| 717 | size_t available; |
| 718 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 719 | struct ctf_field_type_bit_array *ft = |
| 720 | (void *) btr->cur_basic_field_type; |
| 721 | |
| 722 | if (!at_least_one_bit_left(btr)) { |
| 723 | BT_LOGV("Reached end of data: btr-addr=%p", btr); |
| 724 | status = BT_BTR_STATUS_EOF; |
| 725 | goto end; |
| 726 | } |
| 727 | |
| 728 | status = validate_contiguous_bo(btr, ft->byte_order); |
| 729 | if (status != BT_BTR_STATUS_OK) { |
| 730 | /* validate_contiguous_bo() logs errors */ |
| 731 | goto end; |
| 732 | } |
| 733 | |
| 734 | available = available_bits(btr); |
| 735 | |
| 736 | if (ft->size <= available) { |
| 737 | /* We have all the bits; decode and set now */ |
| 738 | BT_ASSERT(btr->buf.addr); |
| 739 | status = read_basic_and_call_cb(btr, btr->buf.addr, |
| 740 | buf_at_from_addr(btr)); |
| 741 | if (status != BT_BTR_STATUS_OK) { |
| 742 | BT_LOGW("Cannot read basic field: " |
| 743 | "btr-addr=%p, ft-addr=%p, status=%s", |
| 744 | btr, btr->cur_basic_field_type, |
| 745 | bt_btr_status_string(status)); |
| 746 | goto end; |
| 747 | } |
| 748 | |
| 749 | consume_bits(btr, ft->size); |
| 750 | |
| 751 | if (stack_empty(btr->stack)) { |
| 752 | /* Root is a basic type */ |
| 753 | btr->state = BTR_STATE_DONE; |
| 754 | } else { |
| 755 | /* Go to next field */ |
| 756 | stack_top(btr->stack)->index++; |
| 757 | btr->state = BTR_STATE_NEXT_FIELD; |
| 758 | btr->last_bo = btr->cur_bo; |
| 759 | } |
| 760 | |
| 761 | goto end; |
| 762 | } |
| 763 | |
| 764 | /* We are here; it means we don't have enough data to decode this */ |
| 765 | BT_LOGV_STR("Not enough data to read the next basic field: setting stitch buffer."); |
| 766 | stitch_set_from_remaining_buf(btr); |
| 767 | btr->state = BTR_STATE_READ_BASIC_CONTINUE; |
| 768 | status = BT_BTR_STATUS_EOF; |
| 769 | |
| 770 | end: |
| 771 | return status; |
| 772 | } |
| 773 | |
| 774 | static inline |
| 775 | enum bt_btr_status read_basic_int_type_and_call_begin( |
| 776 | struct bt_btr *btr) |
| 777 | { |
| 778 | return read_bit_array_type_and_call_begin(btr, read_basic_int_and_call_cb); |
| 779 | } |
| 780 | |
| 781 | static inline |
| 782 | enum bt_btr_status read_basic_int_type_and_call_continue( |
| 783 | struct bt_btr *btr) |
| 784 | { |
| 785 | return read_bit_array_type_and_call_continue(btr, |
| 786 | read_basic_int_and_call_cb); |
| 787 | } |
| 788 | |
| 789 | static inline |
| 790 | enum bt_btr_status read_basic_float_type_and_call_begin( |
| 791 | struct bt_btr *btr) |
| 792 | { |
| 793 | return read_bit_array_type_and_call_begin(btr, |
| 794 | read_basic_float_and_call_cb); |
| 795 | } |
| 796 | |
| 797 | static inline |
| 798 | enum bt_btr_status read_basic_float_type_and_call_continue( |
| 799 | struct bt_btr *btr) |
| 800 | { |
| 801 | return read_bit_array_type_and_call_continue(btr, |
| 802 | read_basic_float_and_call_cb); |
| 803 | } |
| 804 | |
| 805 | static inline |
| 806 | enum bt_btr_status read_basic_string_type_and_call( |
| 807 | struct bt_btr *btr, bool begin) |
| 808 | { |
| 809 | size_t buf_at_bytes; |
| 810 | const uint8_t *result; |
| 811 | size_t available_bytes; |
| 812 | const uint8_t *first_chr; |
| 813 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 814 | |
| 815 | if (!at_least_one_bit_left(btr)) { |
| 816 | BT_LOGV("Reached end of data: btr-addr=%p", btr); |
| 817 | status = BT_BTR_STATUS_EOF; |
| 818 | goto end; |
| 819 | } |
| 820 | |
| 821 | BT_ASSERT(buf_at_from_addr(btr) % 8 == 0); |
| 822 | available_bytes = BITS_TO_BYTES_FLOOR(available_bits(btr)); |
| 823 | buf_at_bytes = BITS_TO_BYTES_FLOOR(buf_at_from_addr(btr)); |
| 824 | BT_ASSERT(btr->buf.addr); |
| 825 | first_chr = &btr->buf.addr[buf_at_bytes]; |
| 826 | result = memchr(first_chr, '\0', available_bytes); |
| 827 | |
| 828 | if (begin && btr->user.cbs.types.string_begin) { |
| 829 | BT_LOGV("Calling user function (string, beginning)."); |
| 830 | status = btr->user.cbs.types.string_begin( |
| 831 | btr->cur_basic_field_type, btr->user.data); |
| 832 | BT_LOGV("User function returned: status=%s", |
| 833 | bt_btr_status_string(status)); |
| 834 | if (status != BT_BTR_STATUS_OK) { |
| 835 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
| 836 | btr, bt_btr_status_string(status)); |
| 837 | goto end; |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | if (!result) { |
| 842 | /* No null character yet */ |
| 843 | if (btr->user.cbs.types.string) { |
| 844 | BT_LOGV("Calling user function (substring)."); |
| 845 | status = btr->user.cbs.types.string( |
| 846 | (const char *) first_chr, |
| 847 | available_bytes, btr->cur_basic_field_type, |
| 848 | btr->user.data); |
| 849 | BT_LOGV("User function returned: status=%s", |
| 850 | bt_btr_status_string(status)); |
| 851 | if (status != BT_BTR_STATUS_OK) { |
| 852 | BT_LOGW("User function failed: " |
| 853 | "btr-addr=%p, status=%s", |
| 854 | btr, bt_btr_status_string(status)); |
| 855 | goto end; |
| 856 | } |
| 857 | } |
| 858 | |
| 859 | consume_bits(btr, BYTES_TO_BITS(available_bytes)); |
| 860 | btr->state = BTR_STATE_READ_BASIC_CONTINUE; |
| 861 | status = BT_BTR_STATUS_EOF; |
| 862 | } else { |
| 863 | /* Found the null character */ |
| 864 | size_t result_len = (size_t) (result - first_chr); |
| 865 | |
| 866 | if (btr->user.cbs.types.string && result_len) { |
| 867 | BT_LOGV("Calling user function (substring)."); |
| 868 | status = btr->user.cbs.types.string( |
| 869 | (const char *) first_chr, |
| 870 | result_len, btr->cur_basic_field_type, |
| 871 | btr->user.data); |
| 872 | BT_LOGV("User function returned: status=%s", |
| 873 | bt_btr_status_string(status)); |
| 874 | if (status != BT_BTR_STATUS_OK) { |
| 875 | BT_LOGW("User function failed: " |
| 876 | "btr-addr=%p, status=%s", |
| 877 | btr, bt_btr_status_string(status)); |
| 878 | goto end; |
| 879 | } |
| 880 | } |
| 881 | |
| 882 | if (btr->user.cbs.types.string_end) { |
| 883 | BT_LOGV("Calling user function (string, end)."); |
| 884 | status = btr->user.cbs.types.string_end( |
| 885 | btr->cur_basic_field_type, btr->user.data); |
| 886 | BT_LOGV("User function returned: status=%s", |
| 887 | bt_btr_status_string(status)); |
| 888 | if (status != BT_BTR_STATUS_OK) { |
| 889 | BT_LOGW("User function failed: " |
| 890 | "btr-addr=%p, status=%s", |
| 891 | btr, bt_btr_status_string(status)); |
| 892 | goto end; |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | consume_bits(btr, BYTES_TO_BITS(result_len + 1)); |
| 897 | |
| 898 | if (stack_empty(btr->stack)) { |
| 899 | /* Root is a basic type */ |
| 900 | btr->state = BTR_STATE_DONE; |
| 901 | } else { |
| 902 | /* Go to next field */ |
| 903 | stack_top(btr->stack)->index++; |
| 904 | btr->state = BTR_STATE_NEXT_FIELD; |
| 905 | btr->last_bo = btr->cur_bo; |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | end: |
| 910 | return status; |
| 911 | } |
| 912 | |
| 913 | static inline |
| 914 | enum bt_btr_status read_basic_begin_state(struct bt_btr *btr) |
| 915 | { |
| 916 | enum bt_btr_status status; |
| 917 | |
| 918 | BT_ASSERT(btr->cur_basic_field_type); |
| 919 | |
| 920 | switch (btr->cur_basic_field_type->id) { |
| 921 | case CTF_FIELD_TYPE_ID_INT: |
| 922 | case CTF_FIELD_TYPE_ID_ENUM: |
| 923 | status = read_basic_int_type_and_call_begin(btr); |
| 924 | break; |
| 925 | case CTF_FIELD_TYPE_ID_FLOAT: |
| 926 | status = read_basic_float_type_and_call_begin(btr); |
| 927 | break; |
| 928 | case CTF_FIELD_TYPE_ID_STRING: |
| 929 | status = read_basic_string_type_and_call(btr, true); |
| 930 | break; |
| 931 | default: |
| 932 | abort(); |
| 933 | } |
| 934 | |
| 935 | return status; |
| 936 | } |
| 937 | |
| 938 | static inline |
| 939 | enum bt_btr_status read_basic_continue_state(struct bt_btr *btr) |
| 940 | { |
| 941 | enum bt_btr_status status; |
| 942 | |
| 943 | BT_ASSERT(btr->cur_basic_field_type); |
| 944 | |
| 945 | switch (btr->cur_basic_field_type->id) { |
| 946 | case CTF_FIELD_TYPE_ID_INT: |
| 947 | case CTF_FIELD_TYPE_ID_ENUM: |
| 948 | status = read_basic_int_type_and_call_continue(btr); |
| 949 | break; |
| 950 | case CTF_FIELD_TYPE_ID_FLOAT: |
| 951 | status = read_basic_float_type_and_call_continue(btr); |
| 952 | break; |
| 953 | case CTF_FIELD_TYPE_ID_STRING: |
| 954 | status = read_basic_string_type_and_call(btr, false); |
| 955 | break; |
| 956 | default: |
| 957 | abort(); |
| 958 | } |
| 959 | |
| 960 | return status; |
| 961 | } |
| 962 | |
| 963 | static inline |
| 964 | size_t bits_to_skip_to_align_to(struct bt_btr *btr, size_t align) |
| 965 | { |
| 966 | size_t aligned_packet_at; |
| 967 | |
| 968 | aligned_packet_at = ALIGN(packet_at(btr), align); |
| 969 | return aligned_packet_at - packet_at(btr); |
| 970 | } |
| 971 | |
| 972 | static inline |
| 973 | enum bt_btr_status align_type_state(struct bt_btr *btr, |
| 974 | struct ctf_field_type *field_type, enum btr_state next_state) |
| 975 | { |
| 976 | unsigned int field_alignment; |
| 977 | size_t skip_bits; |
| 978 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 979 | |
| 980 | /* Get field's alignment */ |
| 981 | field_alignment = field_type->alignment; |
| 982 | |
| 983 | /* |
| 984 | * 0 means "undefined" for variants; what we really want is 1 |
| 985 | * (always aligned) |
| 986 | */ |
| 987 | BT_ASSERT(field_alignment >= 1); |
| 988 | |
| 989 | /* Compute how many bits we need to skip */ |
| 990 | skip_bits = bits_to_skip_to_align_to(btr, (size_t) field_alignment); |
| 991 | |
| 992 | /* Nothing to skip? aligned */ |
| 993 | if (skip_bits == 0) { |
| 994 | btr->state = next_state; |
| 995 | goto end; |
| 996 | } |
| 997 | |
| 998 | /* Make sure there's at least one bit left */ |
| 999 | if (!at_least_one_bit_left(btr)) { |
| 1000 | status = BT_BTR_STATUS_EOF; |
| 1001 | goto end; |
| 1002 | } |
| 1003 | |
| 1004 | /* Consume as many bits as possible in what's left */ |
| 1005 | consume_bits(btr, MIN(available_bits(btr), skip_bits)); |
| 1006 | |
| 1007 | /* Are we done now? */ |
| 1008 | skip_bits = bits_to_skip_to_align_to(btr, field_alignment); |
| 1009 | if (skip_bits == 0) { |
| 1010 | /* Yes: go to next state */ |
| 1011 | btr->state = next_state; |
| 1012 | goto end; |
| 1013 | } else { |
| 1014 | /* No: need more data */ |
| 1015 | BT_LOGV("Reached end of data when aligning: btr-addr=%p", btr); |
| 1016 | status = BT_BTR_STATUS_EOF; |
| 1017 | } |
| 1018 | |
| 1019 | end: |
| 1020 | return status; |
| 1021 | } |
| 1022 | |
| 1023 | static inline |
| 1024 | enum bt_btr_status next_field_state(struct bt_btr *btr) |
| 1025 | { |
| 1026 | int ret; |
| 1027 | struct stack_entry *top; |
| 1028 | struct ctf_field_type *next_field_type = NULL; |
| 1029 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 1030 | |
| 1031 | if (stack_empty(btr->stack)) { |
| 1032 | goto end; |
| 1033 | } |
| 1034 | |
| 1035 | top = stack_top(btr->stack); |
| 1036 | |
| 1037 | /* Are we done with this base type? */ |
| 1038 | while (top->index == top->base_len) { |
| 1039 | if (btr->user.cbs.types.compound_end) { |
| 1040 | BT_LOGV("Calling user function (compound, end)."); |
| 1041 | status = btr->user.cbs.types.compound_end( |
| 1042 | top->base_type, btr->user.data); |
| 1043 | BT_LOGV("User function returned: status=%s", |
| 1044 | bt_btr_status_string(status)); |
| 1045 | if (status != BT_BTR_STATUS_OK) { |
| 1046 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
| 1047 | btr, bt_btr_status_string(status)); |
| 1048 | goto end; |
| 1049 | } |
| 1050 | } |
| 1051 | |
| 1052 | stack_pop(btr->stack); |
| 1053 | |
| 1054 | /* Are we done with the root type? */ |
| 1055 | if (stack_empty(btr->stack)) { |
| 1056 | btr->state = BTR_STATE_DONE; |
| 1057 | goto end; |
| 1058 | } |
| 1059 | |
| 1060 | top = stack_top(btr->stack); |
| 1061 | top->index++; |
| 1062 | } |
| 1063 | |
| 1064 | /* Get next field's type */ |
| 1065 | switch (top->base_type->id) { |
| 1066 | case CTF_FIELD_TYPE_ID_STRUCT: |
| 1067 | next_field_type = ctf_field_type_struct_borrow_member_by_index( |
| 1068 | (void *) top->base_type, (uint64_t) top->index)->ft; |
| 1069 | break; |
| 1070 | case CTF_FIELD_TYPE_ID_ARRAY: |
| 1071 | case CTF_FIELD_TYPE_ID_SEQUENCE: |
| 1072 | { |
| 1073 | struct ctf_field_type_array_base *array_ft = |
| 1074 | (void *) top->base_type; |
| 1075 | |
| 1076 | next_field_type = array_ft->elem_ft; |
| 1077 | break; |
| 1078 | } |
| 1079 | case CTF_FIELD_TYPE_ID_VARIANT: |
| 1080 | /* Variant types are dynamic: query the user, he should know! */ |
| 1081 | next_field_type = |
| 1082 | btr->user.cbs.query.borrow_variant_selected_field_type( |
| 1083 | top->base_type, btr->user.data); |
| 1084 | break; |
| 1085 | default: |
| 1086 | break; |
| 1087 | } |
| 1088 | |
| 1089 | if (!next_field_type) { |
| 1090 | BT_LOGW("Cannot get the field type of the next field: " |
| 1091 | "btr-addr=%p, base-ft-addr=%p, base-ft-id=%d, " |
| 1092 | "index=%" PRId64, |
| 1093 | btr, top->base_type, top->base_type->id, top->index); |
| 1094 | status = BT_BTR_STATUS_ERROR; |
| 1095 | goto end; |
| 1096 | } |
| 1097 | |
| 1098 | if (next_field_type->is_compound) { |
| 1099 | if (btr->user.cbs.types.compound_begin) { |
| 1100 | BT_LOGV("Calling user function (compound, begin)."); |
| 1101 | status = btr->user.cbs.types.compound_begin( |
| 1102 | next_field_type, btr->user.data); |
| 1103 | BT_LOGV("User function returned: status=%s", |
| 1104 | bt_btr_status_string(status)); |
| 1105 | if (status != BT_BTR_STATUS_OK) { |
| 1106 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
| 1107 | btr, bt_btr_status_string(status)); |
| 1108 | goto end; |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | ret = stack_push_with_len(btr, next_field_type); |
| 1113 | if (ret) { |
| 1114 | /* stack_push_with_len() logs errors */ |
| 1115 | status = BT_BTR_STATUS_ERROR; |
| 1116 | goto end; |
| 1117 | } |
| 1118 | |
| 1119 | /* Next state: align a compound type */ |
| 1120 | btr->state = BTR_STATE_ALIGN_COMPOUND; |
| 1121 | } else { |
| 1122 | /* Replace current basic field type */ |
| 1123 | BT_LOGV("Replacing current basic field type: " |
| 1124 | "btr-addr=%p, cur-basic-ft-addr=%p, " |
| 1125 | "next-basic-ft-addr=%p", |
| 1126 | btr, btr->cur_basic_field_type, next_field_type); |
| 1127 | btr->cur_basic_field_type = next_field_type; |
| 1128 | |
| 1129 | /* Next state: align a basic type */ |
| 1130 | btr->state = BTR_STATE_ALIGN_BASIC; |
| 1131 | } |
| 1132 | |
| 1133 | end: |
| 1134 | return status; |
| 1135 | } |
| 1136 | |
| 1137 | static inline |
| 1138 | enum bt_btr_status handle_state(struct bt_btr *btr) |
| 1139 | { |
| 1140 | enum bt_btr_status status = BT_BTR_STATUS_OK; |
| 1141 | |
| 1142 | BT_LOGV("Handling state: btr-addr=%p, state=%s", |
| 1143 | btr, btr_state_string(btr->state)); |
| 1144 | |
| 1145 | switch (btr->state) { |
| 1146 | case BTR_STATE_NEXT_FIELD: |
| 1147 | status = next_field_state(btr); |
| 1148 | break; |
| 1149 | case BTR_STATE_ALIGN_BASIC: |
| 1150 | status = align_type_state(btr, btr->cur_basic_field_type, |
| 1151 | BTR_STATE_READ_BASIC_BEGIN); |
| 1152 | break; |
| 1153 | case BTR_STATE_ALIGN_COMPOUND: |
| 1154 | status = align_type_state(btr, stack_top(btr->stack)->base_type, |
| 1155 | BTR_STATE_NEXT_FIELD); |
| 1156 | break; |
| 1157 | case BTR_STATE_READ_BASIC_BEGIN: |
| 1158 | status = read_basic_begin_state(btr); |
| 1159 | break; |
| 1160 | case BTR_STATE_READ_BASIC_CONTINUE: |
| 1161 | status = read_basic_continue_state(btr); |
| 1162 | break; |
| 1163 | case BTR_STATE_DONE: |
| 1164 | break; |
| 1165 | } |
| 1166 | |
| 1167 | BT_LOGV("Handled state: btr-addr=%p, status=%s", |
| 1168 | btr, bt_btr_status_string(status)); |
| 1169 | return status; |
| 1170 | } |
| 1171 | |
| 1172 | BT_HIDDEN |
| 1173 | struct bt_btr *bt_btr_create(struct bt_btr_cbs cbs, void *data) |
| 1174 | { |
| 1175 | struct bt_btr *btr; |
| 1176 | |
| 1177 | BT_LOGD_STR("Creating binary type reader (BTR)."); |
| 1178 | btr = g_new0(struct bt_btr, 1); |
| 1179 | if (!btr) { |
| 1180 | BT_LOGE_STR("Failed to allocate one binary type reader."); |
| 1181 | goto end; |
| 1182 | } |
| 1183 | |
| 1184 | btr->stack = stack_new(); |
| 1185 | if (!btr->stack) { |
| 1186 | BT_LOGE_STR("Cannot create BTR's stack."); |
| 1187 | bt_btr_destroy(btr); |
| 1188 | btr = NULL; |
| 1189 | goto end; |
| 1190 | } |
| 1191 | |
| 1192 | btr->state = BTR_STATE_NEXT_FIELD; |
| 1193 | btr->user.cbs = cbs; |
| 1194 | btr->user.data = data; |
| 1195 | BT_LOGD("Created BTR: addr=%p", btr); |
| 1196 | |
| 1197 | end: |
| 1198 | return btr; |
| 1199 | } |
| 1200 | |
| 1201 | BT_HIDDEN |
| 1202 | void bt_btr_destroy(struct bt_btr *btr) |
| 1203 | { |
| 1204 | if (btr->stack) { |
| 1205 | stack_destroy(btr->stack); |
| 1206 | } |
| 1207 | |
| 1208 | BT_LOGD("Destroying BTR: addr=%p", btr); |
| 1209 | g_free(btr); |
| 1210 | } |
| 1211 | |
| 1212 | static |
| 1213 | void reset(struct bt_btr *btr) |
| 1214 | { |
| 1215 | BT_LOGD("Resetting BTR: addr=%p", btr); |
| 1216 | stack_clear(btr->stack); |
| 1217 | stitch_reset(btr); |
| 1218 | btr->buf.addr = NULL; |
| 1219 | btr->last_bo = -1; |
| 1220 | } |
| 1221 | |
| 1222 | static |
| 1223 | void update_packet_offset(struct bt_btr *btr) |
| 1224 | { |
| 1225 | BT_LOGV("Updating packet offset for next call: " |
| 1226 | "btr-addr=%p, cur-packet-offset=%zu, next-packet-offset=%zu", |
| 1227 | btr, btr->buf.packet_offset, |
| 1228 | btr->buf.packet_offset + btr->buf.at); |
| 1229 | btr->buf.packet_offset += btr->buf.at; |
| 1230 | } |
| 1231 | |
| 1232 | BT_HIDDEN |
| 1233 | size_t bt_btr_start(struct bt_btr *btr, |
| 1234 | struct ctf_field_type *type, const uint8_t *buf, |
| 1235 | size_t offset, size_t packet_offset, size_t sz, |
| 1236 | enum bt_btr_status *status) |
| 1237 | { |
| 1238 | BT_ASSERT(btr); |
| 1239 | BT_ASSERT(BYTES_TO_BITS(sz) >= offset); |
| 1240 | reset(btr); |
| 1241 | btr->buf.addr = buf; |
| 1242 | btr->buf.offset = offset; |
| 1243 | btr->buf.at = 0; |
| 1244 | btr->buf.packet_offset = packet_offset; |
| 1245 | btr->buf.buf_sz = sz; |
| 1246 | btr->buf.sz = BYTES_TO_BITS(sz) - offset; |
| 1247 | *status = BT_BTR_STATUS_OK; |
| 1248 | |
| 1249 | BT_LOGV("Starting decoding: btr-addr=%p, ft-addr=%p, " |
| 1250 | "buf-addr=%p, buf-size=%zu, offset=%zu, " |
| 1251 | "packet-offset=%zu", |
| 1252 | btr, type, buf, sz, offset, packet_offset); |
| 1253 | |
| 1254 | /* Set root type */ |
| 1255 | if (type->is_compound) { |
| 1256 | /* Compound type: push on visit stack */ |
| 1257 | int stack_ret; |
| 1258 | |
| 1259 | if (btr->user.cbs.types.compound_begin) { |
| 1260 | BT_LOGV("Calling user function (compound, begin)."); |
| 1261 | *status = btr->user.cbs.types.compound_begin( |
| 1262 | type, btr->user.data); |
| 1263 | BT_LOGV("User function returned: status=%s", |
| 1264 | bt_btr_status_string(*status)); |
| 1265 | if (*status != BT_BTR_STATUS_OK) { |
| 1266 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
| 1267 | btr, bt_btr_status_string(*status)); |
| 1268 | goto end; |
| 1269 | } |
| 1270 | } |
| 1271 | |
| 1272 | stack_ret = stack_push_with_len(btr, type); |
| 1273 | if (stack_ret) { |
| 1274 | /* stack_push_with_len() logs errors */ |
| 1275 | *status = BT_BTR_STATUS_ERROR; |
| 1276 | goto end; |
| 1277 | } |
| 1278 | |
| 1279 | btr->state = BTR_STATE_ALIGN_COMPOUND; |
| 1280 | } else { |
| 1281 | /* Basic type: set as current basic type */ |
| 1282 | btr->cur_basic_field_type = type; |
| 1283 | btr->state = BTR_STATE_ALIGN_BASIC; |
| 1284 | } |
| 1285 | |
| 1286 | /* Run the machine! */ |
| 1287 | BT_LOGV_STR("Running the state machine."); |
| 1288 | |
| 1289 | while (true) { |
| 1290 | *status = handle_state(btr); |
| 1291 | if (*status != BT_BTR_STATUS_OK || |
| 1292 | btr->state == BTR_STATE_DONE) { |
| 1293 | break; |
| 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | /* Update packet offset for next time */ |
| 1298 | update_packet_offset(btr); |
| 1299 | |
| 1300 | end: |
| 1301 | return btr->buf.at; |
| 1302 | } |
| 1303 | |
| 1304 | BT_HIDDEN |
| 1305 | size_t bt_btr_continue(struct bt_btr *btr, const uint8_t *buf, size_t sz, |
| 1306 | enum bt_btr_status *status) |
| 1307 | { |
| 1308 | BT_ASSERT(btr); |
| 1309 | BT_ASSERT(buf); |
| 1310 | BT_ASSERT(sz > 0); |
| 1311 | btr->buf.addr = buf; |
| 1312 | btr->buf.offset = 0; |
| 1313 | btr->buf.at = 0; |
| 1314 | btr->buf.buf_sz = sz; |
| 1315 | btr->buf.sz = BYTES_TO_BITS(sz); |
| 1316 | *status = BT_BTR_STATUS_OK; |
| 1317 | |
| 1318 | BT_LOGV("Continuing decoding: btr-addr=%p, buf-addr=%p, buf-size=%zu", |
| 1319 | btr, buf, sz); |
| 1320 | |
| 1321 | /* Continue running the machine */ |
| 1322 | BT_LOGV_STR("Running the state machine."); |
| 1323 | |
| 1324 | while (true) { |
| 1325 | *status = handle_state(btr); |
| 1326 | if (*status != BT_BTR_STATUS_OK || |
| 1327 | btr->state == BTR_STATE_DONE) { |
| 1328 | break; |
| 1329 | } |
| 1330 | } |
| 1331 | |
| 1332 | /* Update packet offset for next time */ |
| 1333 | update_packet_offset(btr); |
| 1334 | return btr->buf.at; |
| 1335 | } |
| 1336 | |
| 1337 | BT_HIDDEN |
| 1338 | void bt_btr_set_unsigned_int_cb(struct bt_btr *btr, |
| 1339 | bt_btr_unsigned_int_cb_func cb) |
| 1340 | { |
| 1341 | BT_ASSERT(btr); |
| 1342 | BT_ASSERT(cb); |
| 1343 | btr->user.cbs.types.unsigned_int = cb; |
| 1344 | } |